Fascinating information and fun comparison. Another thing that is quite interesting is the tapetal reflex of some animals. Canids and Felids will show those creepy "glowing" eyes when caught in the headlights of a vehicle. This is a shiny reflective layer beneath the retina, the tapetum lucidum, that allows light entering the eye and passing through the retina to be reflected back to hit the retina a second time, further enhancing their night vision. Our eyes, in contrast, give the classic "red eye" (that our cameras now try to prevent or correct for) because we haven't a reflective tapetum, and instead, the flash of a camera may actually illuminate the vascular surface of the back of our eyes, giving the red appearance.